单项选择题

Techniques to harness the energy of the sun are being developed.

A．convert
B．store
C．utilise
D．receive
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单项选择题
When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.
A．grow
B．wrap
C．hide
D．test
单项选择题
The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
A．continuously
B．quickly
C．excessively
D．exceptionally
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